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5.1.81 memory
Syntax:
memory ( int_expression )
Type:
- bigint
Purpose:
- returns statistics concerning the memory management:
memory(0) is the number of active (used) bytes,
memory(1) is the number of bytes allocated from the
operating system,
memory(2) is the maximal number of bytes ever allocated from the
operating system during the current SINGULAR session.
Note:
- To monitor the memory usage during ongoing computations the option
mem should be set (using the command option(mem); , see
also option).
Example:
| ring r=0,(x(1..500)),dp;
poly p=(x(1)+x(500))^50;
proc ReportMemoryUsage()
{ "Memory currently used by SINGULAR :",memory(0),"Byte (",
int(memory(0) div 1024), "KByte)" +newline+
"Memory currently allocated from system:",memory(1), "Byte (",
int(memory(1) div 1024), "KByte)";
"Maximal memory allocated from system :",memory(2), "Byte (",
int(memory(2) div 1024), "KByte)";
}
ReportMemoryUsage();
==> Memory currently used by SINGULAR : 209392 Byte ( 204 KByte)
==> Memory currently allocated from system: 2218712 Byte ( 2166 KByte)
==> Maximal memory allocated from system : 2250520 Byte ( 2197 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 156152 Byte ( 152 KByte)
==> Memory currently allocated from system: 2218712 Byte ( 2166 KByte)
==> Maximal memory allocated from system : 2250520 Byte ( 2197 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 145504 Byte ( 142 KByte)
==> Memory currently allocated from system: 2214700 Byte ( 2162 KByte)
==> Maximal memory allocated from system : 2250520 Byte ( 2197 KByte)
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See
option;
system.
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